Deliverability & inbox testing

IP Reputation Checker

Check a sending IP's reputation from real signals — blacklist listings and forward-confirmed reverse DNS — with a transparent 0-100 score. Free, live over DNS.

Assess sending reputation

Enter an IP or domain. We measure real signals — blacklists, reverse DNS and authentication.

What this tool measures

Checks the IP against 10 major DNSBLs
Verifies reverse DNS (PTR) and forward-confirmation
Scores reputation 0-100 from real signals
Resolves a domain's sending IP automatically
Explains fixes in plain English with AI
Runs live over DNS — no cached data

Common use cases

  1. 1Vetting a mail server IP before sending
  2. 2Diagnosing poor deliverability
  3. 3Checking a shared or new IP's standing
  4. 4Confirming reverse DNS is set correctly
  5. 5Monitoring your sending IPs
  6. 6Investigating a reputation drop

Related tools

Email Blacklist CheckerSender Score LookupDeliverability Score CheckerReverse DNS LookupSPF Record CheckerDMARC Record Checker

About IP reputation

An IP's reputation determines whether mailbox providers accept, filter, or reject the email it sends. The strongest, publicly-measurable signals are whether the IP appears on blacklists and whether it has proper reverse DNS that forward-confirms — both of which receivers check on every connection.

This checker measures those real signals and scores them transparently. For a clean reputation, keep the IP off blacklists, set a matching PTR record, and authenticate your mail with SPF, DKIM and DMARC.

More Free Tools Where This Came From

This utility is one of dozens of free, no-login tools for DNS, email, SEO and developers — all instant and private.

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HostCloud.in  ·  Pune, India  ·  Serving 34,987+ Websites Since 2020

FREQUENTLY ASKED QUESTIONS

Got Questions? We Have Answers.

How is IP reputation measured here?

From publicly-measurable signals: whether the IP is on major blacklists and whether it has forward-confirmed reverse DNS. The score is computed transparently from these — it is not a proprietary metric.

Why does reverse DNS matter?

Receiving servers distrust IPs without a PTR record, or whose PTR does not point back to the IP. Forward-confirmed reverse DNS is a basic trust signal for sending mail.

Can I check a domain instead of an IP?

Yes. The tool resolves the domain's sending IP (A record, then MX) and assesses that IP.

How do I improve a poor IP reputation?

Get delisted from any blacklists after fixing the cause, set a matching PTR record, and authenticate mail with SPF, DKIM and DMARC.

Is this the same as Sender Score?

No. Validity's Sender Score is a proprietary metric from their network. This is an independent, transparent score from signals anyone can verify.

Is the check live?

Yes. Blacklists and reverse DNS are queried in real time over DNS-over-HTTPS.